On 12/21/2014 11:49 PM, Anthony D. Baye wrote:
> I've been experimenting with creating lightprobe images for space scenes, using
> a combination of GIMP and PoVRay.
>
> The process is pretty straightforward: I begin by creating a space scene as a
> cubemap in GIMP, I then import the map as a png into a custom model in povray,
> and render using a spherical camera at an aspect ratio of 2:1 (4000x2000) with
> output set to +FE.
>
> The only problem I see with my image is that the stars may be a little too
> dense, or too large, to be realistic when mapped onto the cube.
>
> The real problem I'm having is that I can't seem to get the EXR image to map
> back onto a sphere properly.  It's always very distorted.
>
> I've uploaded the relevant files to my dropbox, since they're a bit large for
> uploading here.  If anybody can tell me what I'm doing wrong, I'd appreciate it.
>
> https://www.dropbox.com/sh/gj5khxb2nqg02kx/AABGsc5rP7PX34sUk3ExJkZFa?dl=0#/
>
> Regards,
> A.D.B.
>
>


Why not simply continue using a cube map? Spherical maps usually look 
like crap anyway. There's some source code below this image:

http://commons.wikimedia.org/wiki/File:Panorama_cube_map.png


Mike

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